feat: add danmuku plugin documentation and i18n setup instructions

- Created a new documentation file for the danmuku plugin with code examples.
- Added comprehensive language settings documentation, including default languages, importing languages, adding new languages, and modifying existing languages.
- Updated the i18n setup examples to reflect the latest changes in language handling.

docs/assets/ts/artplayer-plugin-asr.d.ts

@@ -1,5 +1,3 @@
-import type Artplayer from 'artplayer'
-
 export = artplayerPluginAsr
 export as namespace artplayerPluginAsr;
 
@@ -24,3 +22,6 @@ interface AsrPluginInstance {
 }
 
 declare function artplayerPluginAsr(option?: AsrPluginOption): (art: Artplayer) => AsrPluginInstance
+
+export = artplayerPluginAsr;
+export as namespace artplayerPluginAsr;